Container for electrolytic condensers



1 A. M. GECRGIEV 2,125,373

CONTAINER FOR ELECTROLYTIC CONDENSERS Filed June 23. 1954 c; E E m"vi-wa f? 2 v 12/ 44 l l "Z4 z; i), w- 22 figr- Z0 BY ATTORNEW PatentedAug. 2, 1938 UNITED STATES PATENT OFFICE CONTAINER FOR ELECTROLYTIC CON-DENSERS Application June 23,

4 Claims.

This invention relates generally to electrolytic condensers and moreparticularly to containers for dry or substantially dry electrolyticcondensers.

It is an object of the present invention toprovide a container of goodheat dissipating material for electrolytic condensers particularly ofthe dry or substantially drytype, in which an appreciable amount of heatis generated due to the flow of currents of considerable magnitude.

It is another object of the present invention to seal the containers ina manner that the seal is not affected by a heat treatment to which thecondenser may be subjected subsequently.

It is another object of the present invention to provide a container forelectrolytic condensers -particularly of the dry or substantially drytype,

which is very compact.

If the condensers are to be used in connection with electric motors forstarting a single phase motor for instance, it is a further object ofthe present invention to incorporate in the containers a terminal boardof a simple and inexpensive construction for properly interconnecting amotor, a condenser and a power source.

It is another object of the present invention to provide an improvedvent plug in sealed containers of electrolytic condensers. It is anotherobject of the present invention to hold the condenser sections in placewithin their containers in such manner that air in the con tainers maycirculate around the condenser sections and thus more efiectively coolthe condensers.

35 Further objects and advantages of the present invention will beapparent from the following description, reference being had to theaccompanying drawing wherein a preferred embodiment of the presentinvention is clearly shown.

50 In the drawing:

Fig. 1 is a perspective view of a condenser embodying the presentinvention.

Fig. 2 is a cross-section through the condenser.

1934, Serial No. 732,119

wound and subsequently flattened conventional condenser section It. Theopen container is closed by a cover Hi. The container in is made of anysuitable metal having good heat dissipating properties such as tinnedsteel, and consists of side walls l8 which are formed from one piece andthe ends thereof sealed together by soldering or otherwise, and a bottomwhich is secured to the side walls, 18 by preferably soldering the drawnrim 22 of the bottom to the side walls la. The cover I6 is moldedpreferably from bakelite or hard rubber and has a metal rim insert 24preferably of the same material as the container l8. As best shown inFig. 2, the rim 24 of the cover 46 overlaps the side walls i8 0! thecontainer and is soldered thereto in order to form a perfect seal. Alsomolded in the cover 5 are a plurality of terminals 26 all of whichextend to the outside of the sealed container and two of which extend tothe inside of the container and are connected in any suitable" mannerwith the electrodes 28 'of the condenser section H. The other terminalsserve for the connection of an electric motor with a power source incase where the condenser is used in connection with the electric motorand is directly mounted thereon. I

Due to the fiow 'of currents of considerable magnitude in the condenser,an appreciable amount of heat is generated which naturally isaccompanied by a corresponding expansion of the air and vapors withinthe sealed container. In case the condenser becomes excessivelyoverheated, the following provision is made for permitting the escape ofthe highly compressed air and vapors from the sealed container. As bestshown in Fig. 5, the cover i6 is provided with an opening 30 of twodifferent diameters and an internal shoulder 32. Resting on the shoulder32 and extending across the opening 30 is a diaphragm 34 of flexible orbetter resilient material 'such as rubber, and pressfitted or otherwisesecured in said opening 30 is a washer 36 which clamps the diaphragm 34against the internal shoulder 32. In case the air and vapors in thesealed container I2 become too hot and therefore excessively compressed,the unclamped portion of the diaphragm will become ruptured and the airand vapors may then escape therethrough.

Fig. 6 discloses a modification of the arrangement disclosed in Fig. 5.In Fig. 6, the cover I6 is provided with a similar opening 40 of twodifferent diameters and an internal shoulder 42. A disc 44 of resilientmaterial such asrubber is originally placed on the top surface 46 of thecover and directly above the opening 40 thereof.

An eyelet ll. is then pressed into the opening whereby the disc 44 ispressed against the side walls and the internal shoulder 42 thereof,whereby a central portion 52 of the disc is slightly stretched. Againwhen the air and vapors in the sealed container become too highlycompressed under excessive heat generation of the condenser, thestretched diaphragm portion 52 will become ruptured and permit thecompressed air and vapors to escape from the container.

The diaphragms I4 and 52 naturally permit a limited expansion oi the airin the sealed container as for instance during the reforming of thecondenser. due to the ability of a portion of either diaphragm tostretch within the elastic limits or the diaphragm material.

Referring more particularly to Figs. 2, 3 and 'l, the condenser sectionI l is held spaced from the metal container I! by means of two blocks ofany insulating material such as rubber, cork or wood, which areinterposed between two opposite side walls ll. of the container and thesemi-circular ends of the condenser section. As best shown in Figs. 2and 3, the section engaging surfaces 62 of the blocks 60 are curved soas to conform to the semi-cylindrical shape of the block engagedportions of the condenser section Il. in this manner movement of thecondenser section ll relative to the container II is not only preventedin the direction of arrows 64 but also in a direction at right anglesthereto, wherefore the plane surfaces 56 01 the condenser section areheld spaced from the adjacent side walls ll 01' the container. As bestshown in Figs. 2 and '1, the blocks are considerably shorter than theaxial length of the wound condenser section I4 and are furthermorewedge-shaped so as to be tightly pressed in position. It is obvious thatwith the application of the spacer block, the air in the sealedcontainer may freely circulate around the condenser section and thuseffectively cool the condenser.

In order to prevent any chemical or electrochemical reaction between theelectrolyte of the condenser section and the material of the container,the latter is internally coated with a substance which does notchemically react with the electrolyte. A substance which is sold underthe trade-mark Duco has been found to form a very satisfactory coat andis preferably used because it is universally marketed and not tooexpensive. The molded cover which entirely covers the opening of thecontainer does not chemically react with the electrolyte and thereforeneed not be coated.

While the embodiment of the present invention as herein disclosed,constitutes a preferred form,

. it is to be understood that other forms might be adopted, all comingwithin the scope of the claims which follow:

1. In combination with a sealed container and a wound electrolyticcondenser section therein, angularly spaced wedge-shaped blocks ofinsulating material wedged between the container and curved portions ofthe condenser section therein, the section engaging block surfaces beingof the same shape as the engaged section surfaces.

2. In combination with a rectangular sealed container and a wound andpartially flattened electrolytic condenser section therein, twowedgeshaped blocks of insulating material and shorter than the axiallength of the section wedged between opposite sides of the container andthe oppositely curved portions of the partially flattened section forspacing the latter entirely from the former, the section engaging blocksurfaces being of the same shape as the engaged section portions.

3. In combination with a sealed container and a wound electrolyticcondenser section therein, angularly spaced wedge-shaped blocks ofinsulating material and shorter than the axial length of the section,said blocks being wedged between the container and curved portions ofthe condenser section therein for spacing the latter from the former,the section engaging block surfaces being of the same shape as theengaged section portions.

4. In combination with a sealed container and a dry electrolyticcondenser section fitting loosely therein, at least one pair of wedgesof insulating material pressed between opposite portions of thecontainer wall and the condenser section to keep the latter separatedfrom the container wall, said wedges being shorter than the" condensersection to permit air circulation past the wedges.

ALEXANDER M. GEORGIEV.

